Scroll-chuck.



PATENTED JUNE 12, 1906.

A. E. CHURCH. SCROLL CHUCK. APPLIGATION FILED SEPT. 2, 1904.

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UNITED STATES PATENT OFFICE.

ALBERT E. CHURCH, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO UNION MANUFACTURING COMPANY, OF NEW BRITAIN, CONNECTI- CUT, A CORPORATION OF CONNECTICUT.

SCROLL-CHUCK.

Specification of Letters Patent.

Patented June 12, 1906.

Application filed S p em er 2. 1904. erial No. 223,110.

To all whom it may concern/.-

Be it known that I, ALBERT E. CHURCH, of the city of New Britain, county of Hartford, and State of Connecticut, have invented certain new and useful Improvements in Scroll- Chucks, which improvements are described in the following specification and are illustrated by the accompanying drawings.

My invention relates, primarily, to that class of scroll-chucks in which the scroll is operated by bevel-pinions arranged radially about the axis of the chuck and engaging beveled teeth which are formed upon the back of the scroll.

The objects of the invention are to promote convenience in the use of such chucks, to facilitate the truing of the same, and to prevent loss of motion therein. These objects I accomplish by means of a scroll which is radially adjustable relative to the axis of the chuck, bearings which are applied to the periphery of the scroll and are radially adjustable thereto, mechanism for adjusting the bearings to and with the scroll, pinions arranged on radial axes which are inserted through the wall of the chuck-shell from without and are adjustable to the scroll, and special mechanism for so adjusting such pin- 10118.

In said drawings, Figure 1 is a plan View of a chuck which is constructed in accordance with the principles of my invention. In this view parts are shown in section and the chuck-jaws are omitted. Fig. 2 is a central vertical section of the same chuck on the line a: a: in Fig. 1. This view also includes one of the chuck-jaws. Fig. 3 is a partial vertical section on the line y y in Fig. 1.

In the views the numeral 1 denotes the shell or cylindrical frame of the chuck. This is of a common pattern and preferably formed of a single piece of metal. Its circular head 2 is rovided with radial slots 3 for the jaws 4, ail in the usual manner. The internal cylindrical hub 5 is concentric with shell 1 and integral therewith. The jaws 4 are provided with teeth 6 in the usual manner for engagement with the scroll. The scroll 7, being a beveled annular plate and bearing upon its face the spiral gearing 8 to engage teeth 6 of jaws 4 and upon its back the bevel gear teeth or rack 9 to be engaged by the pinions, is seated about hub 5 in a loose and adjustable manner, while its rim presents a smooth peripheral bearing-surface. The circular cap or back plate 11, which is set into the back of the shell 1 and held therein by screws 12, is integral with the back hub 13, which is concentric with shell 1 and abuts against scroll 7 and hub 5. The bevel-pinions 10, which are set radially around the scroll in the usual manner for the purpose of rotating the same, are severally adjustable in the direction of their own length. For the purpose of such adjustment each pinion is provided either with a central screw 14, taking hold in back hub 13, or with an external screw-ring 15, engaging the head of the pinion or, as shown in Figs. 1 and 2, is provided with both of those devices 14 and 15, as may be preferred. Three crescent feet 16, which are curved to fit the rim of the scroll and are provided with shanks 17, make sliding contacts with the scroll and constitute its bearings. These feet are equidistant from each other and resemble typical independently-moving outside chuck-jaws. They are adapted to adjust the scroll with reference to the axis of the chuck and are themselves adjustable toward and from that axis by means of said shanks and by means of the hollow screws 18, which hold said shanks, respectively, and are seated in screw-holes 19 in the wall of shell 1, as shown in Fig. 1.

Such being the construction of my improved scroll-chuck, its mode ofoperation requires but little description. On the removal of the retaining-rings 15 and the adjusting-screws 14 the pinions 10 may be taken out of the chuck for oiling and other purposes and replaced as may be desired. By turning the hollow screws 18 the bearings 16 are severally adjusted to such positions that scroll 7 is pushed by them to precisely that position which is necessary for the truing of the chuck. By the same means all wear which may occur between the scroll and its said bearings is taken up, and all loss of motion is prevented. In like manner by the mere turmng of the pinion-screws 14 or the screw-rings 15, or both, according as either or both of those devices is used in the construction of the chuck, the pinions are severally adjusted to mesh accurately and without lost motion with the gear-teeth 9 of the scroll 7 whatever be the position to which the scroll may have been adjusted, and all these effects are accomplished by external manipulation and without opening the chuck.

Such being the construction and operation of the device, I claim as my invention- 1. A scroll-chuck, including a jaw-engaging scroll, and screw-actuated mechanism, engaging the rim of the scroll in three places.

2. A chuck-frame, and a scroll, which has a peripheral bearing-surface, in combination with a number of adjustable bearings, which engage such peripheral bearing-surface.

3. A chuclefranie, and a scroll therein, in combination with a number of bearings, engaging the rim of the scroll, and rovided each with a shank, which is seated a justably in said frame.

4. A chuck frame, an adjustable scroll therein, having a rack, in combination with adjustable bearings, which engage the rim of the scroll, and adjustable pinions, which engage the rack of the adjustable scroll.

5. A chuck frame, an adjustable scroll therein, having a rack, radially-adjustable bearings, engaging said scroll, and mechanism for adjusting said bearings, in combination with adjustable pinions, which are adapted to engage the rack on said adjustable scroll, in every position of adjustment of said scroll, and mechanism for adjusting said pinions to such engagement with said scroll.

In testimony whereof I hereunto set my name in the presence of two witnesses.

ALBERT. E. CHURCH.

Witnesses:

WILLARD EDDY, M. D. MONARY. 

